Vitamin D measurment in your own blood

As I mentioned yesterday I look forward to the day when you can measure your own vitamin D levels. Well found on the web such a device. It just costs US$65+P&P. Then I looked up a medlab testing handbook that I down loaded a few years ago. Turns out that they could measure vitamin D levels. Don't know if pathlab does this but would assume so.... so would be interested in finding anyone who has had this tested.